Anode, lithium secondary battery comprising same, battery module comprising the lithium secondary battery, and method for manufacturing anode

Abstract

The present specification relates to an anode, a lithium secondary battery including the same, a battery module including the lithium secondary battery, and a method for manufacturing an anode.

The invention claimed is: 
     
       1. An anode comprising:
 a current collector; 
 a lithium metal layer provided on the current collector; 
 a lithium-silicon composite layer provided on the lithium metal layer; and 
 a silicon layer or silicon oxide layer provided on the lithium-silicon composite layer
 wherein the silicon layer or silicon oxide layer comprises 5-20 parts by weight binder resin based on 100 parts by weight silicon and silicon oxide in the silicon layer or silicon oxide layer. 
 
 
     
     
       2. The anode of  claim 1 , wherein the silicon layer or silicon oxide layer comprises a lithium-silicon composite in which the silicon or silicon oxide is alloyed with lithium. 
     
     
       3. The anode of  claim 1 , wherein a weight ratio of a lithium element to a silicon element in the anode is 100:1 to 50. 
     
     
       4. The anode of  claim 1 , wherein the lithium-silicon composite layer comprises a lithium-silicon composite represented by the following Chemical Formula 1 or a lithium-silicon oxide composite represented by the following Chemical Formula 2:
   Li x Si  [Chemical Formula 1]
 
   Li o SiO p   [Chemical Formula 2]
 
 in Chemical Formulae 1 and 2, x is a real number of 1.0 to 4.0, o is each a real number of 0.3 to 4.0, and p is each a real number of 0.1 to 2.0. 
 
     
     
       5. The anode of  claim 1 , wherein the silicon layer or silicon oxide layer is the outermost layer. 
     
     
       6. An anode comprising:
 a current collector; 
 a lithium metal layer provided on the current collector; and 
 a lithium-silicon composite layer provided on the lithium metal layer and containing a lithium-silicon composition in which silicon or silicon oxide is alloyed with lithium,
 wherein the lithium-silicon composite layer comprises 5-20 parts by weight binder resin based on 100 parts by weight silicon and silicon oxide in the lithium-silicon composite layer. 
 
 
     
     
       7. The anode of  claim 6 , wherein the lithium-silicon composite layer comprises a lithium-silicon composite represented by the following Chemical Formula 1 or a lithium-silicon oxide composite represented by the following Chemical Formula 2:
   Li x Si  [Chemical Formula 1]
 
   Li o SiO p   [Chemical Formula 2]
 
 in Chemical Formulae 1 and 2, x is a real number of 1.0 to 4.0, o is each a real number of 0.3 to 4.0, and p is each a real number of 0.1 to 2.0. 
 
     
     
       8. The anode of  claim 6 , wherein the lithium-silicon composite layer is the outermost layer. 
     
     
       9. A lithium secondary battery comprising:
 the anode of  claim 1 ; and a cathode, and 
 an electrolyte provided between the anode and the cathode. 
 
     
     
       10. The lithium secondary battery of  claim 9 , wherein the electrolyte is an electrolyte liquid in which the anode and the cathode are impregnated. 
     
     
       11. The lithium secondary battery of  claim 10 , further comprising:
 a separation membrane provided between the anode and the cathode. 
 
     
     
       12. The lithium secondary battery of  claim 9 , wherein the electrolyte is a solid electrolyte membrane or a polymer electrolyte membrane. 
     
     
       13. A battery module comprising the lithium secondary battery of  claim 9  as a unit cell.